()the age of eighteen, he had written two books.

If he had been in better health, he______more books.

A．can write

B．could have written

C．could write

D．have written

If he had been in better health, he______more books.

A．can write

B．could have written

C．could write

D．have written

He was______ for military service at the age of eighteen and spent a year in the army.

A．called in

B．sent out

C．called up

D．taken on

______ , Mozart had already written his first composition.

A．His age was six

B．By the age of six

C．He was six

D．Six years old

He bought two books. _____________ I.

A. So was

B. So did

C. So do

He bought two books. _____she.

A. So did

B. So was

C. So does

A．Because he had worked in a computer shop.

B．Because he had written some computer programs.

C．Because he is clever and works hard at his lessons.

D．Because he had learnt to use computers at school.

He has ______ four successful books.

A. written

B. wrote

C. been writing

His written English was first-class, and he had a(n)______ vocabulary for a sophomore.

A．intimate

B．initial

C．inevitable

D．incredible